Johnsonbaugh, Richard. Discrete mathematics / By Richard Johnsonbaugh. - 2nd ed. - New York : Macmillan College Publishing Company , 1984. - xiv,705p. ; 24 cm. ISBN: 0029464293 Subjects--Topical Terms: Logic and proofsAlogrithmsNetwork models and petri nets Dewey Class. No.: 511.8 / JOHR